Electric signal.



. No. 843,283. PATENTBD FEB. 5, 1907.

c. L. KRUM.

ELECTRIC SIGNAL. APPLICATION FILED JAN. 10, 1903.

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I 06/ lfi ol lgh UNITED sTATns PATENT orrron;

CHARLES KRUM, or CHICAGO, ILLINOIS.

ELECTRIC SIGNAL.

Specification of Letters Patent.

Patented Feb. 5, 19 07 Application filed January 10,1903. Serial No.138,578.

- Chicago, county of Cook, and State of Illinois, have invented certainnew and useful Improvements in Electric Signals, of which the followingis declared to be a full, clear, and exact description.

' The invention relatesto audible electrical signals used in connectionwith telephones, and for other purposes, and seeks to provide a simpleconstruction which may be easily adjusted and kept in order and whichmay be readily operated over a long line.

The invention consists in the features of construction and arrangementof arts set forth in the following description, il ustrated in theaccompanying drawing, and more par- .ticularly pointed out in theappended claims. y In the drawing the preferred form of the invention isillustrated in elevation with the support for the operating parts shownin sec: tion.

A suitable support 1 is provided, which may be a part of a suitablecasing for inclosin the operating parts of the signal. A fieTd-magnet 2,of suitable magnetic steel, is

secured to the under side of the sup ort 1 by means of screws 3. Themain bocy of the magnet 2 extends downwardly or at right an- Igiles tothe support 1, while'its upper end is ent laterally and is held againstthe sup v ort '1 by the screws'3. The lower end'or p0 e of thefield-magnet extends laterally and then upwardly, as.shown.'

To the lower upwardly-projecting end of the field-magnet 2 is secured alaterally-projecting bracket 4, preferably of brass or othernon-magnetic mate ial. The bracket is held in place upon the end of thefield-magnet by a'rivet 5 or in any other suitable man ner. A vibratingarmature 6, of soft iron, is, pivoted,"as at 7, to the outer end ofbracket 4 and extends inwardly over the upwardly-extending pole of thefield-magnet 2. Preferably an adjusting-screw 8 is provided for the armature 6 against which screw the armatureis normall held by the action ofthe permanent fiel -magnet 2 The adjustingscrew 8 is preferably of brassor other nonmagnetic material and may be conveniently threaded throughthe laterallyextending portion of the field-magnet and may be providedwith a suitable lock-nut 9.

.An operating-electromag'net for the armationed as shown aboveandadjacent thear ture 6 is provided and preferably com rises asingle-spool magnet 10, which is fixe at one end to the upper end of thefield-magnet 2 by means of a brass screw 11. The electromagnet 10: ispreferably separated from the end of the field-magnet 2 by means of aninterposed block or washer 12', of brass or other suitable non-magneticmaterial. The lower end or poleof the electromagnet 10 is posimature 6.

-A tappet 13 is arranged to be operated by the armature 6 and ispreferably connected. thereto at itspivot-point 7 The upper free end ofthe tappet- 13' extends through an opening 14 in the support I and isarranged to strike one or more sounders or bells 15, secured to theupper side of the support 1.

Preferably two sounders or bells are'employed on opposite sides of theupper end of the tappet 13.

face farthest from the ad acent pole of the field-magnet is of likecharacter to such adj a- "cent pole. If now a pulsating current istransmitted over the line and through the electromagnet 10 in such adirection that the pole of the electromagnet adjacent the armature ,6 isof a character 0 osite to that of the adjacent pole of the fie d-magnet2, the armature will be rapidly vibrated, together-with tappet 13, andthe bells orsounders' will be strucka succession of blows. If, however,the pulsating current is in the op osite direction, the armature 6 willbe repe led and not The armaturefi, of soft iron,.is polarized by v theaction of thefield-magnet 2, 'so that its successively attracted orvibrated and-the signal will not sound. The instrument thus presents asimple and effective form of a 00'- called biased signal, which may becon veniently used in connection with party-line telephones and forother purposes The signal may be operated by an alternating cur rent, ifdesired.

The armature isheld by the permanent magnet againstithe screw or'stop 8,which may be adjusted and held in adjusted position to insure delicateoperation of the 'si nal. It will be observed that the pole of the eld-Inagnet 2 adjacentthe armature 6 extends at right angles thereto and inposition to effeet a strong pull upon'the armature and insure its returnto normal position. It will also be observed that the poles of theoperating-electromagnet 10 and of the fieId-magnet IIO Zarearranged onopposite sides of the vibratingarmature 6 in position to readily effectthe vibration of the armature.

Numerous changes may be made in the details of structure withoutdeparture from the essentials of the invention as defined by theclaims.V

Having described my invention, What. I claim as new, and desire tosecure by Letters Patent, 1s J 1. An electric signal comprising avibrating armature, a suitable support, a perma-.

nent field-magnet carried by said support and projecting therefrom, theend or said magnet farthermost from said support beingextendedlater'ally adjacent one side of said vibrating armature, anoperating-electro magnet carried by said support and having one only. ofits poles'arranged adjacent the opposite side of said vibratingarmature,a sounder carried by said support and a tappet operated by said armaturearranged to strike said sounden 2. -An electric signal comprising ahorizon-- tal support, a permanent field-magnet 'GX-r tending downwardlytherefrom and having its lower end bent laterally and then upwardly, ahorizontally-disposed vibrating an mature arranged above and pivoted ona bracket secured to the lower upturned end of said permanentfield-magnet, an operatingelectromagnet carried by said support andextending downwardly therefrom and having one of its poles arrangedadjacent'an'd above said vibrating armature, an adjusting-screw againstwhich said armature 1s normally held by said permanent field-magnet, .abell or sounder carried by said support and a tappet operated by saidarmature and arrangedto strike said bell or sounder.

, 3. A biased electric signal comprising a pivoted vibrating armature, apermanent field-magnet and an operating electromagnet, each of saidmagnets having one onlyof its ranged to strike said sounder.

poles arranged adjacent the free end of said vibrating armature, saidpoles being arranged opposite'each' other and on opposite sides of saidarmature, a-sounder ant a tappet oper ated by said armature and arrangedto strike said sounder.

45 An electric signal comprising a support, a vibrating armaturepivoted. below saidsilriport,a ermanent' field-magnet and a single spoole ectroma not mounted on said support and eXten ing downwardly therefromwith the lowermost poles arranged adjacent the free end of saidvibrating armature, an

adjustable stop against which said armature is i normally held bysaidpermanent field-magnet, a tappet connected to said vibratingarmature anda hell or sounder carried by said support and arranged to bestruck by said rtappet.

5. An armature, an operating-electromagnet therefor, a permanent magnethaving its poles arranged adjacent respectively the op osite poles ofsaid electromagnet, each of sai ma nets having one only of itspolesarranged a jaoent and on opposite sides of said armature,

a sounder and a tappet operated by saidar:

mature arranged to strike said sounder.

U 6.- An electric signal comprising a pivoted stop against whichsaid'armature is normally held by said permanent magnet, a sounderand atappet operated by said armature ar- CHARLES L.

Witnesses:

HARRY L. CLAPP, ALBERTA ADAMIGK! electric signal comprising a pivoted

